/*
 * Copyright 2017-2025 noear.org and authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.noear.solon.maven.plugin;

import java.io.File;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.stream.Collectors;

/**
 * Helper class to build the command-line arguments of a java process.
 *
 * @author Stephane Nicoll
 */
final class CommandLineBuilder {

    private final List<String> options = new ArrayList<>();

    private final List<URL> classpathElements = new ArrayList<>();

    private final String mainClass;

    private final List<String> arguments = new ArrayList<>();

    private CommandLineBuilder(String mainClass) {
        this.mainClass = mainClass;
    }

    static CommandLineBuilder forMainClass(String mainClass) {
        return new CommandLineBuilder(mainClass);
    }

    CommandLineBuilder withJvmArguments(String... jvmArguments) {
        if (jvmArguments != null) {
            this.options.addAll(Arrays.stream(jvmArguments).filter(Objects::nonNull).collect(Collectors.toList()));
        }
        return this;
    }

    CommandLineBuilder withSystemProperties(Map<String, String> systemProperties) {
        if (systemProperties != null) {
            systemProperties.entrySet()
                    .stream()
                    .map((e) -> SystemPropertyFormatter.format(e.getKey(), e.getValue()))
                    .forEach(this.options::add);
        }
        return this;
    }

    CommandLineBuilder withClasspath(URL... elements) {
        this.classpathElements.addAll(Arrays.asList(elements));
        return this;
    }

    CommandLineBuilder withArguments(String... arguments) {
        if (arguments != null) {
            this.arguments.addAll(Arrays.stream(arguments).filter(Objects::nonNull).collect(Collectors.toList()));
        }
        return this;
    }

    List<String> build() {
        List<String> commandLine = new ArrayList<>();
        if (!this.options.isEmpty()) {
            commandLine.addAll(this.options);
        }
        if (!this.classpathElements.isEmpty()) {
            commandLine.add("-cp");
            commandLine.add(ClasspathBuilder.build(this.classpathElements));
        }
        commandLine.add(this.mainClass);
        if (!this.arguments.isEmpty()) {
            commandLine.addAll(this.arguments);
        }
        return commandLine;
    }

    static class ClasspathBuilder {

        static String build(List<URL> classpathElements) {
            StringBuilder classpath = new StringBuilder();
            for (URL element : classpathElements) {
                if (classpath.length() > 0) {
                    classpath.append(File.pathSeparator);
                }
                classpath.append(toFile(element));
            }
            return classpath.toString();
        }

        private static File toFile(URL element) {
            try {
                return new File(element.toURI());
            } catch (URISyntaxException ex) {
                throw new IllegalArgumentException(ex);
            }
        }

    }

    /**
     * Format System properties.
     */
    private static class SystemPropertyFormatter {

        static String format(String key, String value) {
            if (key == null) {
                return "";
            }
            if (value == null || value.isEmpty()) {
                return String.format("-D%s", key);
            }
            return String.format("-D%s=\"%s\"", key, value);
        }

    }

}
